MTR/SASSI UI software is a fully integrated graphical user interface that facilitates development, visualization, and execution of 3D SSI models in MTR/SASSI. The significant features of this UI are described below.

-3D visualization of models includes model translation, rotation, transformation, zooming, resizing, wire frame, solid mesh, glass mesh and section cutaways as well as selected plots of joints, nodes, elements, properties, soil layers, symmetry planes, and section cut planes.
-Robust implementation of graphics allow quick rendering of large SSI models incorporating detailed structural FE models.
-The UI currently incorporates user interfaces for: SITE, POINT, CONTRL, HOUSE, MOTOR, ANALYS, FBASE, MOTION and STRESS modules.
-The UI is capable of importing structure and excavated soil models “as is” from SAP2000 s2k and ANSYS cdb files as well as tabulated data sheets.
-The UI is capable of automatically binding the structure and excavated soil models with different node labeling.
-All model and analysis data are saved in separate tables which can be edited in a spreadsheet format.
-Extensive data checks are performed during data entry to minimize errors and save time.
-Input data files are saved automatically and can be used to run each module on a separate thread interactively or in batch mode.
-Results of each run — including log, error, warning, and output files — can be inspected in separate tabs within the UI.
-Graphical output of results include contour plots of response accelerations, velocities, displacements, forces, moments and stresses.  Response time histories and spectral accelerations are imported to excel sheets for plotting.
-Graphics rendered on screen can be routed to printers for hard copy or exported as images in several formats including JPEG, GIF and EMF.
-Multiple work sessions can be initiated simultaneously, and each session can be saved and restarted later.
-All input, output, and intermediate files are fully compatible with all versions of MTR/SASSI.